IHM Part I maintenance procedure

What vessel operators should track after IHM certification: Part I changes, MD/SDoC evidence, review cadence, and survey-ready records.

28 Jul 2026 · 7 min read

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Commercial vessel in shipyard maintenance with cranes and vessel equipment

IHM basics

Understand scope, certificates, and the three IHM parts

Start here when you need the regulatory picture before choosing a maintenance process.

Aerial view of a large superyacht underway, representing privately operated vessels over 500 GT

IHM applicability6 min read

Does my vessel need an IHM? Scope, 500 GT, and EU port calls

A practical guide to IHM scope for vessels: the 500 GT threshold, international voyages, EU port calls, and flag/class checks.

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Aerial view of a red tanker underway at sea

Hong Kong Convention8 min read

Hong Kong Convention and IHM: what changed

The HKC entered into force in June 2025. What its IHM requirements mean for vessel teams, certification, and Part I maintenance.

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Close view of a large green cargo vessel bow at berth

HKC and EU SRR7 min read

HKC and EU SRR IHM certificates: what applies in 2026?

How the HKC ICIHM, EU Inventory Certificate, 2026 combined certificate format, and third-country Statement of Compliance fit together.

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Top-down view of a large yacht and tender alongside

IHM basics7 min read

IHM Part I, II and III explained

What IHM Part I, Part II, and Part III cover, and why Part I is the maintained operational record during the vessel's life.

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Bulk carrier alongside an industrial terminal berth

ICIHM deadline6 min read

ICIHM deadline for existing ships: what 26 June 2030 means

Existing ships within scope of the Hong Kong Convention must meet the IHM requirements no later than 26 June 2030. Here is how the deadline and initial survey work.

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Maintenance loop

Keep Part I current through refits and vessel changes

Practical workflows for the DP, Chief Engineer, and technical team responsible for the living record.

Offshore support vessel underway in coastal waters

IHM roles6 min read

The IHM Designated Person: role and responsibilities

What the IHM Designated Person does, how the role fits vessel teams, and how to keep Part I maintenance from drifting.

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Small commercial vessel hauled out for maintenance and refit work

Refit workflow8 min read

IHM and your refit: a briefing for DPs and Chief Engineers

How DPs and Chief Engineers should handle IHM Part I changes, MD/SDoC evidence, and documentation during a vessel refit.

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Large yacht deck and equipment detail with tender and helipad area

Chief Engineer workflow7 min read

Refrigerants, ODS, and your IHM

How ODS refrigerants affect IHM Part I, MARPOL Annex VI records, and Chief Engineer documentation after service work.

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Large yacht bow at night alongside a harbour berth

Older vessels8 min read

IHM on older vessels: when the builder's records don't exist

How older vessels can establish an IHM when builder records are missing: document review, visual inspection, sampling, and Part I baseline.

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Supplier evidence

Collect MD/SDoC/SDS evidence without losing the link to the vessel

How to ask suppliers for the right declarations and keep the evidence attached to the exact IHM change.

Aerial view of cruise and passenger vessels alongside a port terminal

Supplier evidence6 min read

How to manage supplier MD/SDoC requests

A practical workflow for requesting MD and SDoC evidence from suppliers and keeping declarations attached to IHM Part I changes.

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Container vessels and cranes at a busy commercial port

MD and SDoC evidence7 min read

Material Declarations and SDoC: managing IHM evidence

What Material Declarations and SDoC are, when vessel teams need them, and how to keep supplier evidence attached to Part I changes.

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Survey readiness

Prepare for class, flag, PSC, and management review

Use these guides when the record must stand up to inspection rather than just exist as paperwork.

Passenger ferry alongside a terminal berth

Renewal survey7 min read

Before your IHM renewal survey: a preparation checklist

A practical checklist for IHM renewal survey preparation: certificate dates, Part I changes, supplier evidence, and record access.

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PSC and survey7 min read

IHM and Port State Control: what inspectors check

What PSC or class reviewers usually check in an operational IHM review: certificate dates, Part I, changes, and supplier evidence.

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Software choice

Choose the right operating model for IHM maintenance

Compare spreadsheets, class tools, managed services, and independent software for vessel operators and fleets.

Large yacht underway near a rocky coastline

IHM software6 min read

IHM software for vessel operators

What vessel operators should expect from IHM software: Part I maintenance, supplier evidence, certificate tracking, audit trail, and exports.

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Fleet IHM software6 min read

IHM maintenance software for fleets

What fleet operators need from IHM maintenance software: consistent vessel records, supplier evidence, dates, audit trail, and exports.

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Software comparison6 min read

IHM software vs spreadsheets

Where spreadsheets break down for IHM maintenance, and when vessel operators should move Part I records and evidence into software.

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Large yacht deck at sunset with crew silhouette

IHM software comparison5 min read

Class tool vs independent IHM software

How class-specific IHM tools compare with independent IHM software for operators managing mixed vessels, flags, and evidence workflows.

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